e.g. <opencv2/core/core.hpp> become <opencv2/core.hpp>

Also renamed <opencv2/core/opengl_interop.hpp> to <opencv2/core/opengl.hpp>

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

hopefully fixed handling of 'long' Python type in OpenCV bindings (bug #2193). added the corresponding test

Extended python bindings to support scalar values and tuples in place of InputArray (i.e. Mat) - ticket #2658. Added tests for #2611, #2505, #2658

-Change input/output order from (out Labeled, in Image) -> (in Image, Out Labeled) and convert
to Input/OutputArrays in the process.

-Adopt OutputArray for statistics export so that the algorithm is "wrapper friendly" and not requiring a new struct in
language bindings at the expense of using doubles for everything and slowing statistics computation down..

[edit: cleaned whitespace]

work on #2100: pyopencv_to functions now can receive argument information through ArgInfo structure. Non-contiguous input numpy arrays are copied. In case of non-contiguous output array the TypeError is thrown.

make Mat::at<>(i) work with 2d matrices (to retrieve all elements in row-major order) (reported by Kurt) and fixed bug #1804

lot's of changes; nonfree & photo modules added; SIFT & SURF -> nonfree module; Inpainting -> photo; refactored features2d (ORB is still failing tests), optimized brute-force matcher and made it non-template.